The kids had her outside for a walk and they saw her pick a small black walnut from the ground. They tried to get it out but then had to pick her up to move her because a car came by, so they think she ingested part of it. This was about 30 min. ago. She had dry kibble shortly before going out and has had water since coming in. I called the vet and they just gave me the number for the ASPCA Poison Control, but it is a $75 fee for them to give a consultation over the phone. In googling, it says there can be a fungus on the black walnuts that can be poisonous. Not sure if I should wait and watch for symptoms? The piece was probably an inch or less in size we think. My big concern is she is only about 15 lbs.